syzbot


KCSAN: data-race in io_sq_thread / io_sq_thread_park (7)

Status: auto-obsoleted due to no activity on 2023/12/28 08:55
Subsystems: io-uring
[Documentation on labels]
Reported-by: syzbot+ac14eb967bf5cb7e2207@syzkaller.appspotmail.com
First crash: 101d, last: 98d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park (5) io-uring 1 305d 305d 0/26 auto-obsoleted due to no activity on 2023/06/04 19:25
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park fs 13 634d 801d 0/26 auto-closed as invalid on 2022/07/10 14:43
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park (4) io-uring 4 358d 399d 0/26 auto-obsoleted due to no activity on 2023/04/20 22:18
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park (8) io-uring 2 20d 46d 0/26 moderation: reported on 2024/01/14 09:32
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park (2) io-uring 5 562d 598d 0/26 auto-closed as invalid on 2022/09/20 09:21
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park (6) io-uring 4 207d 252d 0/26 auto-obsoleted due to no activity on 2023/09/11 04:02
upstream KCSAN: data-race in io_sq_thread / io_sq_thread_park (3) io-uring 2 495d 522d 0/26 auto-obsoleted due to no activity on 2022/11/26 22:35

Sample crash report:
==================================================================
BUG: KCSAN: data-race in io_sq_thread / io_sq_thread_park

write to 0xffff88811e5dc4b8 of 8 bytes by task 18908 on cpu 1:
 io_sq_thread+0xbd5/0xc50 io_uring/sqpoll.c:316
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

read to 0xffff88811e5dc4b8 of 8 bytes by task 47 on cpu 0:
 io_sq_thread_park+0x1b/0x80 io_uring/sqpoll.c:45
 io_ring_exit_work+0x178/0x4f0 io_uring/io_uring.c:3114
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0xffff88811dcd30c0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 47 Comm: kworker/u4:3 Not tainted 6.7.0-rc2-syzkaller-00029-g9b6de136b5f0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events_unbound io_ring_exit_work
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/23 08:54 upstream 9b6de136b5f0 fc59b78e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_sq_thread / io_sq_thread_park
2023/11/20 10:08 upstream eb3479bc23fa cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_sq_thread / io_sq_thread_park
* Struck through repros no longer work on HEAD.